build(deps-dev): bump dulwich from 1.0.0 to 1.2.5

Bumps [dulwich](https://github.com/dulwich/dulwich) from 1.0.0 to 1.2.5.
- [Release notes](https://github.com/dulwich/dulwich/releases)
- [Changelog](https://github.com/jelmer/dulwich/blob/main/NEWS)
- [Commits](jelmer/dulwich@dulwich-1.0.0...dulwich-1.2.5)

---
updated-dependencies:
- dependency-name: dulwich
  dependency-version: 1.2.5
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]